<template>
  <el-dialog
    width="500px"
    title="员工导入"
    :visible="showExcelDialog"
    @close="$emit('update:showExcelDialog', false)"
  >
    <el-row type="flex" justify="center">
      <div class="upload-excel">
        <input
          ref="excel-upload-input"
          class="excel-upload-input"
          type="file"
          accept=".xlsx, .xls"
          @change="uploadChange"
        >
        <div class="drop">
          <i class="el-icon-upload" />
          <el-button type="text" @click="downloadTemplate">下载导入模板</el-button>
          <span>将文件拖到此处或
            <el-button type="text" @click="uploadEmployeeExcel">点击上传</el-button>
          </span>
        </div>
      </div>
    </el-row>
    <el-row type="flex" justify="end">
      <!-- update:props属性名，值 直接修改 .sync修饰符的属性值 -->
      <el-button size="mini" type="primary" @click="$emit('update:showExcelDialog', false)">取消</el-button>
    </el-row>
  </el-dialog>
</template>
<script>
import employeeApi from "@/api/employee"
export default {
  props: {
    showExcelDialog: {
      type: Boolean,
      default: false
    }
  },
  methods:{
    // 下载导入的模板
    async downloadTemplate(){
      const resultBlob = await employeeApi.downloadTemplate();
      // console.log(resultBlob);
      //FileSaver.saveAs("blob对象", "文件名");
      const blob = new Blob([resultBlob], {
        type: "application/vnd.ms-excel",
      });
      const downloadUrl = URL.createObjectURL(blob);
      const link = document.createElement("a");
      link.href = downloadUrl;
      link.download = "员工信息模板.xls"; // 设置下载的文件名
      document.body.appendChild(link);
      link.click();
      URL.revokeObjectURL(downloadUrl);
    },

    // 上传员工信息,弹出windows的文件选择器
    uploadEmployeeExcel(){
      //1:弹出文件选择器,在web浏览器中，如果想弹出一个文件windows的选择器，只有一种方式，就是通过 input type=file类型
      //this.$refs.属性名 和 this.$refs[属性名] 等价
      this.$refs['excel-upload-input'].click();

    },
    // @change="uploadChange" 监听input的change事件，在我们输入了任何内容或者是选择了文件时都会触发
    async uploadChange(event){
      const files = event.target.files;
      console.log(files.length);//这里是选择的文件
      console.log(files[0]);
      //大于0说明选择了文件
      if(files.length>0){
        const formData = new FormData();
        formData.append("file", files[0]);
        try{
            //调用接口，上传文件
        await employeeApi.uploadEmployeeExcel(formData)
        //上传成功后，关闭弹框
        this.$emit('update:showExcelDialog', false)
        //上传成功后，刷新列表
        this.$emit('uploadOnSuccess')//通知父组件，我们这边子组件已经上传成功
        // this.$refs['excel-upload-input'].value = ''
        }catch(error){
          //捕获失败,清空文件选择器
          // this.$refs['excel-upload-input'].value = ''
        }finally{
          //不管成功还是失败都会清空文件选择器
          this.$refs['excel-upload-input'].value = ''
        }
      }
      

    },
  }
  
}
</script>

<style scoped lang="scss">
    .upload-excel {
      display: flex;
      justify-content: center;
      margin: 20px;
      width: 360px;
      height: 180px;
      align-items: center;
      color: #697086;
      .excel-upload-input {
        display: none;
        z-index: -9999;
      }
      .btn-upload,
      .drop {
        border: 1px dashed #dcdfe6;
        width: 100%;
        height: 100%;
        text-align: center;
        line-height: 160px;
        border-radius: 8px;
        display: flex;
        flex-direction: column;
        justify-content: center;
      }
      .drop {
        line-height: 40px;
        color: #bbb;
        i {
          font-size: 60px;
          display: block;
          color: #c0c4cc;
        }
      }
    }
</style>

